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InboxTrue

Freemium#29 of 31 in Email Verification APIs

InboxTrue: A focused validation API for large one-off bulk orders and developer workflows. Ranked #29 of 31 in Email Verification APIs by our editors (6.4/10); pricing: Free plan; best for large one-off bulk orders.

6.4/10Editor score

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InboxTrue6.4 Visit InboxTrue

At a glance

Editor score
6.4 / 10
Pricing
Free plan
Best for
Large one-off bulk orders
Free plan
Yes
Real-time API
Yes
Facts checked
20 Sep 2026

Where it wins
- Bulk validation supports up to 200,000 emails per order
- Checks SMTP, DNS/MX, disposable, and catch-all status
- Signed webhooks notify you when bulk jobs are complete
Where it doesn't
- Paid validation starts with a $50 one-time purchase
- The free tier is limited to 1 request per second
- Core plans do not list integrations beyond the API and web dashboard

Our verdict on InboxTrue

InboxTrue is an email validation service from MixRank for developers and businesses that need to check addresses before sending messages or accepting signups. Its API covers syntax, DNS and MX records, SMTP mailbox status, disposable or temporary domains, and catch-all domains. The product supports synchronous single-email validation as well as asynchronous bulk jobs, making it suitable for both individual checks and larger address-cleaning workflows.

Pricing is structured around a free tier, pay-as-you-go credits, and an Enterprise plan. The Free tier includes 1,000 validations per month, requires no credit card, and allows 1 request per second. Pay as you go costs $50 one time, has no minimums, lets credits never expire, and does not add a surcharge for realtime versus bulk validation. Enterprise adds custom volume and rate limits, dedicated support, invoicing, and a DPA available on request. This makes the free tier useful for modest validation needs, while the paid model is oriented toward buyers making larger one-off purchases.

The standout capability is the combination of detailed mailbox checks and high-volume processing. Bulk orders can contain up to 200,000 emails, and signed webhooks can report when jobs finish. API key management is handled through the dashboard, and the product is available through web and API interfaces. InboxTrue fits teams that want focused validation primitives and webhook-based bulk processing. Buyers needing broader platform integrations or a lower initial paid commitment should consider alternatives; teams prioritizing SMTP, DNS, catch-all, disposable detection, and large batch capacity have a clearer fit here.

Your product? Our editors can test InboxTrue in depth and publish a review, labelled as paid · from $149/mo →

InboxTrue pricing

Plans Free planFreemium A usable free plan; paid tiers unlock the limits above. Prices checked 20 Sep 2026.

See plans on inboxtrue.com

All 3 InboxTrue plans and prices →

InboxTrue fact sheet

Free plan	Yes
Paid from	Not verified
Real-time API	Yes
Batch verification	Yes
Disposable detection	Yes
Role account detection	Not verified
Catch-all detection	Yes
SMTP mailbox check	Yes
Deployment	Cloud
Platforms	Web
Compliance & security	SOC 2
Support	Email, Docs
Built for	Small business, Mid-market, Enterprise (editorial estimate)
Pricing	Free plan (source)
Website	inboxtrue.com
Facts checked	20 Sep 2026

Alternatives to InboxTrue

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Featured on iTechGuides

InboxTrue is listed in our Email Verification APIs directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

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Last updated 7 Oct 2026 · How we research and update